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Impairment and restructuring charges - Schedule Restructuring and Related Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ (1.1) $ 17.1 $ (2.4) $ 16.6
Severance payments        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs (1.1) 14.8 (1.3) 14.3
Employee benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 0.0 2.1 (1.1) 2.1
Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs (0.3) 3.1 (1.2) 2.8
Corporate | SG&A        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs (0.3) 8.6 (0.6) 8.5
Corporate | R&D        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs (0.5) 5.4 (0.6) 5.3
MCM Products | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs (0.4) 2.7 (1.2) 2.6
All other segments | Operating Segments        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 0.1 $ 0.4 $ 0.0 $ 0.2